Question

a piece of wood of uniform cross section and 15 cm height sinks 10 cm in water and 12 cm in Spirit find the relative density of wood and spirit

Answer 1

relative density of wood=10/15=2/3
density of wood/density of s.=12/15=4/5
it means 2/3*10^3/density of spirit =4/5
10000/4*3=5000/6kg/m^3
relative density of spirit=5000/6/1000=5000/6*1000=5/6 done!!